Pencil sharpener



FIG. 1 is a front view of a pencil sharpener showing our new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines are included to show portions of the pencil sharpener that form no part of the claimed design. 

CLAIM The ornamental design for a pencil sharpener, as shown and described. 